: Lux [lx]
Illumination (E) is the luminous flux and the ratio between the area of exposure factor.
1 lx refers to an average of 1 lm of luminous flux in the area of the plane lm2 brightness.

Lighting important terms

If all the other technology industries, light industry has its jargon. These special terms and concepts can be a clear definition of the characteristics of the light source and lights, and the standardization of measurement units, the following is most important that the terms.


Lighting terminology commonly used flux: Symbol Φ, lumens unit Lm, that kind of light-emitting-per-second issued by the sum of the amount of light, that is, the flux


Light: Symbol I, unit candela cd, that luminous body in the direction of a particular unit solid angle with the launch of flux


Illumination: Symbol E, Lux units Lm/m2, that light-emitting radiation in the body as object per unit area on the flux


Brightness: symbol L, units from Nepal cd/m2, that luminous body in the direction of a particular unit solid angle per unit area of flux



1cd = 1000mcd per square meter brightness calculation method for

Red tube brightness control of the Green + + brightness of the light blue tube

1000 × per square = points per square brightness

Calculated brightness as a result of environmental factors include the loss of brightness


Light effect: unit lumens per watt Lm / w, electric light source that will be converted into electrical energy capacity of light to the issue of power consumption divided by the flux to express

Average life expectancy: unit hour, that means the number of light bulbs to 50 percent of the amount of damage when the number of hours

Economic life: an hour unit, bearing in mind that in the light beam output, as well as damage to the state of decay, its integrated output beam to a specific number of hours. This ratio for the outdoor light source for 70 percent for the indoor fluorescent light source as compared with 80 percent.


Color: light color and light fired at a temperature blackbody radiation light color at the same time, the black body temperature is called the color temperature of light source.

Different color temperature light source, light colors are different in color temperature below 3300K stable atmosphere, warm feeling; color temperature in 3000 - 5000K for the color temperature in the middle, feeling refreshed; 5000K color temperature in the cold for more than a feeling . Different light sources of light in different colors make the best environment, such as:

Light color temperature atmosphere effect

> 5000K cool (blue with white) cold atmosphere

3300-5000K in the middle (white) readily atmosphere

<3300K warm (with red and white) and stable atmosphere

a. color temperature and high-brightness light source color temperature exposure, such as brightness is not high, people have a chi of the atmosphere; low radiation light source color temperature, high brightness give people a feeling of heat.

b. light color contrast in the same room for the use of two light color great light source, there will be a contrast of their level of effectiveness of large-ray contrast color, brightness level was at the same time, the level of available light color.

Color:

The light color and color-rendering index is to show that it is said that the objects in the light color than the benchmark light (sunlight) when the color of the lighting can deviate from a more comprehensive anti -

Light colors reflect the characteristics.

There are two color

Faithful color: the right to show the color of the material would have required the use of color-rendering index (Ra) of high light source, close to 100 of its value, the color of the best.

Color effects: To clear a particular emphasis on color, showing the lives of the United States and Canada can use the law to enhance the color effect of color.

Use of low-temperature light exposure can make more bright red;

Use of color temperature of light exposure, so that the blue with a sense of cool;

High-temperature radiation light source so that the objects have the feeling of cold.


Light and radiation
Just electromagnetic radiation to the human eye, the visual nerve is converted to light, that the naked eye can see that part of the spectrum. This type of ray in the wavelength range 360 to 830nm, only a very small spectrum of electromagnetic radiation, a part of. 50Hz temperature is much higher than the temperature of work, resulting in a higher color temperature of white color and better form of color.


Light and radiation

Flux Φ
: Lm [lm]
Light source and the launch of the person receiving the eyes of the energy flux is the sum of (Φ).


Light l
: Candela [cd]
In general, all the light in different directions to the launch, and different intensity. Visible light at a particular angle in the direction of the launching of the light intensity is called (l).



Light distribution

"

Light (l) in respect of the specified direction angle (w) with the launch of the luminous flux (Φ) illumination E





Luminance L
: Candela / m [cd/m2]
Luminance (L)
That is a direction from the eye can see objects of the reflected light intensity.




Light effect
Unit: lumens per watt [lm / W]
Light is the effect of light energy into electrical energy efficiency.


Color temperature
: Kelvin [K]
When the light emitted by the color of the "black body" radiation at a temperature of the same color, "bold" and called on the temperature of the color temperature of light source. "Blackbody" The higher the temperature, composition of the blue spectrum is more, and the red component is the less. For example, the incandescent light color is warm white, the color temperature for that 2700K, sunlight and fluorescent color of the color temperature method that is 6000K.


Light color
Light color is actually a color temperature. Big points to three main categories:
Warm <3300K
5000K color to the middle of 3300
As the light spectrum in the composition of a difference, so even if the same light color, light and color may also be different.

Lighting efficiency
Efficient lamps (also known as light output coefficient) is a measure of the efficiency of energy use of lighting is an important standard, which is the output of light energy lamps and lamp light source inside the light output ratio between the energy.

Indoor lighting on the man-made light of the detailed information, please see DIN5035 standards.



Color -
In principle, the artificial light with natural light should be the same as the human eye is able to distinguish things in the right colors, of course, the lighting according to the location and purpose.

The light color shows the extent of objects known as the color of. Often called the "color-rendering index" (Ra).

Color is the thing of the true color (the color of their own) with a standard light source revealed that under the color of the relationship. To determine the value of Ra is to DIN6169 standards defined in 8 kinds of testing standards for light and color in the test was done under the light of comparison, the smaller the color difference is measured shows that the color of the light source of color, the better.
Ra value of 100 light sources, said things under the lights in their display of color and light under the same standard.

Reference link: http://www.17led.com/LEDdisplay/2008-03/9.html